<!--
 * @Author: your name
 * @Date: 2021-03-16 11:10:54
 * @LastEditTime: 2021-03-16 22:55:01
 * @LastEditors: Please set LastEditors
 * @Description: In User Settings Edit
 * @FilePath: \xu\shop_manager\shop_vue\src\components\goods\Add.vue
-->
<template>
   <div>
     <el-breadcrumb separator-class="el-icon-arrow-right">
       <el-breadcrumb-item :to="{path: '/home'}">首页</el-breadcrumb-item>
       <el-breadcrumb-item>商品管理</el-breadcrumb-item>
       <el-breadcrumb-item>添加商品</el-breadcrumb-item>
     </el-breadcrumb>
     <!-- 卡片视图 -->
     <el-card>
       <!-- 提示区 -->
       <el-alert title="添加商品信息" type="info" show-icon center :closable="false"></el-alert>
       <!-- 步骤条 -->
       <el-steps :active="activeIndex - 0" align-center>
         <el-step title="基本信息"></el-step>
         <el-step title="商品参数"></el-step>
         <el-step title="商品属性"></el-step>
         <el-step title="商品图片"></el-step>
         <el-step title="商品内容"></el-step>
         <el-step title="完成"></el-step>
       </el-steps>
       <!-- 左边的tab栏 -->
       <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
         <el-tabs v-model="activeIndex" :tab-position="'left'" 
         :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类">
              <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" 
              v-model="addForm.goods_cat" @change="handleChange"  prop="goods_cat"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" 
                :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action表示图片要上传到后台api地址 , list-type 表示图片上传后的显示效果-->
            <!-- 此上传操作没有用到axios -->
            <el-upload action="http://127.0.0.1:8888/api/private/v1/upload"
            :on-preview="handlePreview" :on-remove="handleRemove" 
            list-type="picture" :header="headerObj" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑组件 -->
            <quill-editor v-model="addFrom.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
       </el-form>
     </el-card>
     <!-- 图片预览 -->
     <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
       <img :src="previewPath" alt="" class="previewImg">
     </el-dialog>
   </div>
</template>

<script>
export default {
   data () {
      return {
        activeIndex: '0',
        // 添加商品的表单数据对象
        addForm: {
          goods_name: '',
          goods_price: 0,
          goods_weight: 0,
          goods_number: 0,
          // 商品所属的分类数组
          goods_cat: [],
          // 图片数组
          pics: [],
          // 商品的详情描述
          goods_introduce: '',
          attrs: []
        },
        addFormRules: {
          goods_name:[
            {required: true, message: '请输入商品名称', trigger: 'blur'}
          ],
          goods_price:[
            {required: true, message: '请输入商品价格', trigger: 'blur'}
          ],
          goods_weight:[
            {required: true, message: '请输入商品重量', trigger: 'blur'}
          ],
          goods_number:[
            {required: true, message: '请输入商品数量', trigger: 'blur'}
          ],
          goods_cat:[
            {required: true, message: '请选择商品分类', trigger: 'change'}
          ]
        },
        // 商品分类列表
        catelist: [],
        cateProps: {
          label:'cat_name',
          value: 'cat_id',
          children: 'children'
        },
        // 动态参数列表数据
        manyTableData: [],
        // 静态属性列表数据
        onlyTableData: [],
        // 图片上传组件的headers请求头对象
        headerObj: {
          Authorization: window.sessionStorage.getItem('token')
        },
        previewPath: ''
      };
   },
   created(){
     this.getCateList()
   },
   components: {},
   computed: {
     cateId() {
       if(this.addForm.goods_cat.length === 3) {
        //  取索引为2那项
         return this.addForm.goods_cat[2]
       }
      //  返回null，说明没有三级分类
       return null
     }
   },
   methods: {
    //  获取所有商品分类数据
    async getCateList() {
      const {data: res} = this.$http.get('categories')
      if(res.meta.status !== 200){
        return this.$message.error('获取商品分类数据失败')
      }
      this.catelist = res.data
    },
    // 级联选择器选中项变化，触发此函数
    handleChange() {
      if(this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave(activeName, oldActiveName) {
      if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    async tabClicked() {
      // 说明访问的是动态参数面板
      if(this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.addForm.goods_cat/attributes}`,
        { params: {sel: 'many'}})
        if(res.meta.status !== 200) {
          return this.$message.error('获取动态列表参数失败')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      }
      if(this.activeIndex === '2') {
        const {data: res} = await this.$http.get(`categories/${this.addForm.goods_cat/attributes}`,
        {
          params: {sel: 'only'}
        })
        if(res.meta.status !== 200) {
          this.$message.error('获取静态属性失败')
        }
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      // 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 从pics数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 调用数组的splice方法把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(i, 1)
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      // 拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 将图片信息对象，push到pics中
      this.addForm.pics.push(picInfo)
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(valid => {
        if(!valid) {
          return this.$message.error('请填写必要的表单项')
        }
        // 执行添加的业务逻辑
        // 深拷贝
        const form = json.parse(json.stringify(this.addForm))
        // 将数组变成字符串
        form.goods_cat = this.form.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_vals: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
         // 处理静态属性
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_vals: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // 发起请求添加商品
        const { data: res } = this.$http.post('goods',form)
        if(res.meta.status !== 200) {
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功')
        this.$router.psuh('/goods')
      })
    }
   }
}
</script>
<style lang='less' scoped>
  .el-checkbox{
    margin: 0 5px 0 0 !important;
  }
  .previewImg{
    width: 100%;
  }
  .btnAdd {
    margin-top: 15px;
  }
</style>